纳米TiO_2光催化剂降解甲基橙的动力学模拟研究

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英文篇名：Kinetic model research for Nano TiO_2 photo-catalysts degradation methyl orange 作者：李峰 ; 张会 ; 郑经堂 ; 卞贺 英文作者：Li Feng~1,Zhang Hui~1,Zheng Jingtang~(2*) and Bian He~3 (1.Institute of Binzhou Environmental Protection of Shandong Province,Binzhou 256600,Shandong,China) (2.State Key Laboratory of Heavy Oil,China University of Petroleum(East China),Qingdao 266555,Shandong,China) (3.Binzhou Key Laboratory of Material Chemistry,Department of Chemistry and Chemical Engineering,Binzhou University, Binzhou 256603,Shandong,China) 关键词：煅烧温度 ; 纳米TiO_2 ; 光催化降解 ; 甲基橙 ; 动力学方程 英文关键词：calcination temperature;;Nano TiO_2;;catalytic degradation;;methyl orange;;new dynamic equation 中文刊名：JSYH 英文刊名：Computers and Applied Chemistry 机构：滨州市环境保护科学技术研究所;中国石油大学(华东)重质油国家重点实验室;滨州学院化学与化工系,滨州市材料化学重点实验室; 出版日期：2013-02-28 出版单位：计算机与应用化学 年：2013 期：v.30 基金：国家自然科学基金项目(20776159);; 中央高校基本科研业务专项资金资助(09CX05009A);; 山东省自然科学基金资助项目(ZR2009FL028);; 滨州学院青年人才创新工程项目(BZXYQNLG201202) 语种：中文; 页：JSYH201302012 页数：4 CN：02 ISSN：11-3763/TP 分类号：43-46

摘要

TiO_2具有很好的紫外吸收和高催化活性。作为一种廉价和环境友好的光催化剂,纳米TiO_2在废水处理、空气净化和太阳能电池等方面都具有潜在应用。为筛选出优良的催化剂,必须对纳米TiO_2构效关系进行深入研究。计算机模拟作为动力学研究的重要手段之一,对于研究光催化纳米TiO_2材料XRD参数与活性关系,具有重要意义。本文通过溶胶—凝胶法制备了纳米TiO_2光催化剂,进行了XRD测试。以难降解的偶氮染料甲基橙为探针,选取材料制备中的关键影响因素,在不同的热处理温度下测定其降解甲基橙活性。在此基础上,提出一个新的速率方程模拟煅烧温度对TiO_2光催化降解甲基橙的影响.结果表明,随着温度的升高,反应速率从指数型到S-型、V-型传变。与普通的动力学方程相比,所提出的新微分方程能对这种影响进行很好的模拟。
        Titanium dioxide(TiO_2) is of strong UV absorption and catalytic performance.As a kind of cheap and environment friendly photocatalyst,the TiO_2 particles(especially its nanoparticles) have been considered as potential materials in some fields,such as sewage treatment,air purification and solar cells.In order to select proper catalyzer,structure-activity/property relationship for TiO_2 must be further researched.As a effective dynamics research methods,computer simulation was used to study the structure-effective relationship of TiO_2 photocatalysts in this paper.The nanometer TiO_2 were prepared by sol-gel method at different temperatures.The samples were characterized using X-ray diffraction(XRD).Using refractory azo dyes methyl orange as fluorescent probe,the photo-catalysts activity were determined under UV light irradiation.To simulate the effect of TiO_2 degradation Methyl orange at different calcination temperature,a new improved dynamic mathematical model method was obtained.The results showed that the reaction tate changed from exponential type to S type and then to V type with temperature increasing.Compared with general dynamical equations,the new dynamical equation of this paper proposed can best Simulate reaction behavior of photo-catalytic activity of TiO_2 for methyl orange at different temperature.

引文

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